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  1. Hi all, Im new to this forum. I apologize if my post is in the wrong place. I have a 2003 Chev Suburban 1500 2wd 5.3 Flex Fuel Vin:Z with 180K miles. Problem: At present my finances, thus my diy attempt. Problem with Vehicle: Over a period of months my air conditioner slowly became less and less cool. I see refrigerant bubbling from Low Pressure Service Port and feel air pressure against my finger when covering the High Side Service Port. At the time my vehicle never stayed parked long enough (teens) to do any further checking. Now they have their own vehicle, time to see about my AC. I connected the manifold hoses and the system has no refrigerant in it, as I suspected once the compressor didnt try to cycle on any longer when turning on the ac. I researched “leakingAC service ports” and to my understanding GM’s ACs systems have faulty ball & flap style parts inside their service port housing that aren’t replaceable. However it is possible to purchase the housing which contain the ball and flap inside. By most accounts its a simple unscrew the old part and screw in replacement, just being careful to realize it unscrews in the center, and does not unscrew from the line itself. At the auto parts store I told them I need to replace both my High & Low side service ports and they showed a me a kit which contained both housings (the fatter high side port and slimmer Low side port, both have a threaded end for screwing in as a replacement) it also contained red and blue caps and schrader valve cores. This was where I should have questioned the reason for valve cores being in the kit but I thought it must be an either/or kind of kit but everything I read said “Replace the port housing because of the faulty GM ports leak after disconnecting the manifold couplings” So with my system empty already, I unscrew the High side port. Replace with the new one, screwed right in, fit well. Then tried the same with the Low side port. After several failed attempts to unscrew it, its now rounded off, bent and still hasn’t budged. My Question 1:Does the Low Pressure Service Port (near the dryer thats wrapped in foil near firewall) {its the port where refrigerant is recieved into the system} unscrew in the middle like the High Side port did, so that the upper housing of the port can be replaced?? Of course I have since seen the Low side port has a Schrader valve inside. Problem: Replacing Schrader valve may solve the leak problem BUT thats irrelevant when the system cant be recharged due to the manifold coupling not fitting well enough to seal because of the mangled upper half of the housing. 2: If it should unscrew, any suggestions what will loosen it? 3: If I have to replace the aluminum line where the low port is, what is the name of that line and should I replace anything else while Im at it bc Ive read some ppl say replace accumalator/dryer and orifice tube if the system is going to be opened at that point anyways? Any suggestions are appreciated I really messed up at first not paying attention if specific lines were referenced as I read about leaking AC service ports. Apparently most ppl experience with leaks are on the high side because when I tried to research specifically for the low side replacement, I can’t find anything about replacing the port housing, only the schrader valve, which has me thinking I might be looking at replacing the line due to my messing it up. I apologize about long post but wanted to go ahead and explain the long as the short might get more questions than answers. Also I have vacuum pump, and know how much refrigerant to recharge (134-A) just need to get Low pressure service port replaced if possible??
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